/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.config.spring.parsers.processors;

import org.mule.runtime.config.spring.parsers.PreProcessor;
import org.mule.runtime.config.spring.parsers.assembly.configuration.PropertyConfiguration;
import org.mule.runtime.core.util.StringUtils;

import org.w3c.dom.Element;

public class AttributeConcatenation implements PreProcessor {

  private String target;
  private String separator;
  private String[] sources;

  public AttributeConcatenation(String target, String separator, String[] sources) {
    this.target = target;
    this.separator = separator;
    this.sources = sources;
  }

  public void preProcess(PropertyConfiguration config, Element element) {
    StringBuilder concat = new StringBuilder();
    boolean first = true;
    for (int i = 0; i < sources.length; ++i) {
      String value = config.translateValue(sources[i], element.getAttribute(sources[i])).toString();
      if (StringUtils.isNotEmpty(value)) {
        if (first) {
          first = false;
        } else {
          concat.append(separator);
        }
        concat.append(value);
      }
    }
    element.setAttribute(target, concat.toString());
  }

}
